You have been using this for over ten years now and you have had more profits than losses. It's hard to believe that such a betting system can work for such a long period of time. Placing multiple bets at the same time is very risky because there's a high chance of losing everything. You also claim to be a pro at this strategy. If this is really true then you must become really successful from gambling now. If you can show us some winnings for us to be convinced that you are as good as you are then this would be valid.
Such a strategy can never work consistently, so the ops mentioning a 10-year success span is almost an elusion because such doesn't work in any form of gambling unless the games are being rigged to favor all the time which is not the situation here, so for sure the guy is lying to us all, he may be looking for a subscription to his predictions group, which ultimately won't be the solution to making wrong predictions but rather another means to even lose more.